Transformation yielding, plasticity, and crack-growth-resistance (R-curve) behavior of CeO sub 2 -TZP

Technical Report · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6197716

Yu, C S; Shetty, D K

Transformation yield and plasticity, transformation zone sizes at crack tips and rising crack-growth-resistance (R-curve) behaviours were studied in a commercial-grade ceria partially stabilized zirconia polycrystalline material (CeO{sub 2}-TZP). The yield stresses measured in three-point bending decreased from 390 to to 176 MPa when the sintering temperature was varied from 1425 to 1525 deg C. The corresponding total plastic strain to fracture increased with decreasing yield stress. Crack-tip transformation zones in precracked, annealed and loaded single-edge-notch-bend specimens decreased significantly in size with increasing transformation yield stress; however, the R-curves were relatively insensitive to the yield stresses or the transformation zone sizes. The measured zone sizes and R-curves were examined in terms of both crack shielding and plastic yield strip zone models.

• Research Organization: Utah Univ., Salt Lake City, UT (USA). Dept. of Materials Science and Engineering
• OSTI ID: 6197716
• Report Number(s): AD-A-225602/2/XAB; CNN: DAAL03-87-K-0060
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CRACK PROPAGATION
CRACKS
CRYSTALS
FABRICATION
FRACTURE MECHANICS
MECHANICAL PROPERTIES
MECHANICS
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
POLYCRYSTALS
RARE EARTH COMPOUNDS
SHIELDING
SINTERING
STABILIZATION
TRANSITION ELEMENT COMPOUNDS
WEAR RESISTANCE
YIELD STRENGTH
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES